They have Mythic Strength but Legendary classification. The Mythic classification just an additional 4% strength tacked on to the boosted stats. Hence why Neptus at max level is approximately 4% stronger than Fomhar at max level in terms of AP even though Neptus is a Mythic dragon and Fomhar is a Legendary dragon. Or Corthanak is about 4% stronger than Coatl in terms of AP despite being a Mythic Harbinger and Coatl is a Legendary Harbinger. They’re all Mythics statwise.